Resin printers produce miniature busts with individual eyelashes visible. FDM printers produce drone arm prototypes that survive a 40 mph impact. They solve fundamentally different problems, and buying the wrong one for your use case means a $300 machine collects dust in the corner. For FPV pilots — FDM wins for 95% of what we print. Here’s why, and the 5% where resin is genuinely better.
Resin (SLA/MSLA) vs FDM — The Real Differences
Resolution and Surface Finish
Resin printers (SLA and MSLA) cure liquid photopolymer resin layer by layer with UV light. Consumer MSLA printers like the Elegoo Mars 5 and Anycubic Photon Mono M7 use a masked LCD screen to flash entire layers at once. The pixel size on a 10-inch 8K monochrome screen is ~29 microns (0.029mm). FDM printers deposit a 0.4mm bead of melted plastic — the minimum feature size is the nozzle diameter.
The practical result: A resin print has invisible layer lines at 0.05mm layer height. The surface feels like injection-molded plastic. An FDM print at 0.12mm layer height has visible layer lines that require sanding, filling, and painting to match. For display models, miniatures, and cosmetic parts, resin wins without competition.
But for functional parts — drone mounts, brackets, prototype arms — that glass-smooth surface finish doesn’t matter. What matters is whether the part breaks when you tighten a screw into it. And resin fails that test.
Mechanical Properties — This Is Why FDM Wins for Drones
Standard photopolymer resin (Anycubic Standard, Elegoo Standard) is brittle. Like, “drop it from waist height onto concrete and it shatters” brittle. The cured polymer has high compressive strength but near-zero impact resistance. Tap a resin GoPro mount against a gate at 30 mph and it fractures into sharp shards.
FDM materials span a massive property range:
– PLA: Stiff, brittle, poor heat resistance (softens at 55°C) — fine for prototyping, terrible for drone parts that sit in the sun
– PETG: Flexible enough to absorb impacts, heat resistant to 80°C, excellent layer adhesion — the baseline for drone mounts and brackets
– TPU: Flexible, impact-resistant, nearly indestructible in thin sections — the only material for GoPro mounts and antenna holders that survive crashes
– ABS/ASA: Heat resistant to 100°C, UV resistant, stiffer than PETG — good for frame prototype plates exposed to sun
– Nylon/PA: High strength, high impact resistance, high temperature resistance — the professional choice for functional drone parts, but requires an enclosure and dry filament
The strength comparison in real terms: A PETG GoPro mount printed at 0.2mm layer height with 4 perimeters survives being run over by a car. A resin GoPro mount printed with “ABS-like” tough resin snaps in half when you tighten the mounting screw to 1 Nm. The difference is layer adhesion: FDM layers are melted together — they’re the same plastic. Resin layers are chemically bonded, but the bond is weaker than the bulk material.
There ARE engineering resins that approach FDM strength — Siraya Tech Blu (tensile strength 40 MPa), Liqcreate Strong-X, Phrozen TR250. But they cost $60-80 per liter (vs $20/kg for PETG), require more aggressive post-curing, and still don’t match PETG’s impact resistance. For $80, you can buy 4 kg of PETG — enough for 80-100 drone mounts.
Post-Processing — The Resin Workflow Tax
This is the part resin printer marketing doesn’t show you.
Resin post-processing (every print, no exceptions):
1. Remove the print from the build plate (gloves required — uncured resin is a skin irritant)
2. Wash in isopropyl alcohol (IPA) for 5-10 minutes in a wash station or ultrasonic cleaner
3. Remove supports BEFORE curing (resin supports snap off cleanly, but they leave small marks)
4. Post-cure under UV light for 5-15 minutes (wash & cure station or DIY UV chamber)
5. Dispose of IPA waste and contaminated gloves/paper towels (resin-contaminated waste is hazardous — not household trash in most jurisdictions)
Total time from print-complete to part-in-hand: 15-25 minutes. You also need a well-ventilated space because resin fumes are unpleasant at best, sensitizing allergens at worst.
FDM post-processing (optional for functional parts):
1. Remove the print from the build plate
2. Peel off the skirt/brim
3. Done
For cosmetic FDM parts: sand, fill, prime, sand again, paint. But for a TPU GoPro mount going on a quad that’s about to hit a tree at 40 mph, step 3 is the last step.
Print Volume and Speed
Resin printers have small build volumes. An Elegoo Mars 5 (entry-level, $250) has a 6.6-inch LCD with a build volume of ~155x100x180mm — you’re printing one or two small parts at a time. An Elegoo Saturn 4 (mid-size, $450) doubles the volume but you’re still limited by the LCD screen area.
FDM printers at the same price point have significantly larger build volumes. An Ender 3 V3 ($220) prints 220x220x250mm. A Sovol SV06 Plus ($300) prints 300x300x340mm. You can print an entire set of drone parts — 4 arms, 2 camera mounts, antenna holders, and a GoPro mount — on one FDM bed in one print.
Resin print speed has improved dramatically with monochrome LCD screens (2-3 second layer exposure vs 6-8 seconds for older RGB screens), but it’s still slower than FDM for large parts. A 100mm tall print at 0.05mm layers is 2,000 layers. At 3 seconds per layer, that’s 100 minutes — and the print time is entirely determined by height, not volume. FDM print time depends on volume and perimeters. A short, wide bracket prints in 20 minutes on FDM and 60 minutes on resin.
Resin vs FDM: Head-to-Head Comparison
| Criterion | Resin (SLA/MSLA) | FDM | Winner for FPV |
|---|---|---|---|
| Surface finish | Near-injection-molded, invisible layers | Visible layer lines, sanding required | Resin (for cosmetics) |
| Impact resistance | Poor (except engineering resins) | Excellent (PETG, TPU, nylon) | FDM |
| Heat resistance (standard) | 50-60°C | PLA: 55°C, PETG: 80°C, ABS: 100°C | FDM |
| Material cost | $25-40/L standard, $60-80/L engineering | $15-25/kg PETG, $20-30/kg TPU | FDM |
| Post-processing | 15-25 min (wash, cure, support removal) | Near zero for functional parts | FDM |
| Print volume (under $300) | 155x100x180mm | 220x220x250mm | FDM |
| Detail capability | 0.029mm (pixel size) | 0.4mm (nozzle diameter) | Resin |
| Hazardous materials | Yes (uncured resin, IPA waste) | No (PLA/PETG are non-toxic) | FDM |
| Best for | Display models, miniatures, detailed small parts | Functional parts, brackets, mounts, prototypes | FDM (95% of drone parts) |
When Resin Actually Makes Sense for FPV
Camera lens protectors: An ND filter holder or lens cap with snap-fit geometry prints beautifully in resin. The precision of SLA lets you print M20x0.5 threads that actually screw on smoothly. FDM threads at this pitch are rough and require post-processing.
Goggle accessories: Custom diopter lens holders, faceplate clips, and antenna mount adapters benefit from resin’s surface finish and precision. These parts don’t experience impact loads, so brittleness isn’t a concern.
Aesthetic canopy parts: If you’re building a show quad with custom canopy elements, resin’s surface finish eliminates hours of sanding and painting. Print the canopy in resin, the functional mounts in PETG, and combine them.
Small, high-detail widgets: Thumbstick caps, gimbal protectors, SD card holders — anything where the part fits in the palm of your hand and detail matters more than strength.
Common Mistakes & How to Avoid Them
Mistake 1: Buying a resin printer thinking you’ll print drone parts with it. The marketing shows glossy, detailed prints. The marketing doesn’t show the one you dropped on the floor that shattered into 12 pieces. Consequence: you print 3 drone mounts, all 3 break during installation or first flight, and the printer becomes a display piece. Fix: Start with FDM for drone parts. Buy a resin printer later for the specific use cases it excels at — camera accessories, goggle mods, and aesthetic parts.
Mistake 2: Underestimating the resin post-processing commitment. You need a dedicated wash and cure station ($100-150), a steady supply of 99% IPA ($15/gallon, replaced every 20-30 prints), nitrile gloves, paper towels, and a ventilated space. The “plug and play” promise of modern resin printers ignores the workspace requirements. Consequence: you set up the printer in a spare bedroom and discover that the resin smell permeates the entire floor. Your partner/spouse/roommate is not happy. Fix: Resin printing lives in a garage, basement, or dedicated workshop with active ventilation. If you don’t have that space, don’t buy a resin printer.
Mistake 3: Using standard resin for parts that need impact resistance. “ABS-like” and “Tough” resins are better than standard, but they’re still photopolymers — they’re crosslinked plastic, not thermoplastic. Crosslinked materials don’t yield; they fracture. Consequence: you spend $45 on “ABS-like” resin, print a GoPro mount, and it cracks on the first gate tap. Fix: If it needs to survive impact, print it in TPU on an FDM printer. Resin’s mechanical ceiling is below FDM’s mechanical floor for impact-critical parts.
⚠️ Safety Notice: UV-curable resins are skin irritants and potential sensitizers. Prolonged or repeated exposure can cause allergic reactions. Always handle uncured resin with nitrile gloves, work in a well-ventilated area, and cure all resin waste before disposal. Uncured resin and IPA waste are considered hazardous in many jurisdictions — check local disposal regulations. FDM printing with ABS/ASA releases VOCs; print in a ventilated area or use an enclosure with filtration.
For the FPV pilot’s workshop, the right combination is an FDM printer as the workhorse — PETG for structural mounts, TPU for impact-absorbing parts — and a resin printer reserved for the small, detailed accessories where surface finish matters more than strength. As we covered in our guide to 3D printed FPV parts, TPU is the material that saves your GoPro, and our filament comparison walks through the full property tradeoffs.
uavmodel stocks PETG and TPU filaments optimized for drone part printing — the PETG prints cleanly at 240°C with minimal stringing, and the 95A TPU feeds reliably through Bowden and direct-drive extruders without jamming.