The 3" OpenFrame: a CNC carbon fibre freestyle FPV frame in the incutec OpenDrone line. The 3" and 5" frames are separate repositories: OpenFrame-3F and OpenFrame-5F.
flowchart LR
O["Onshape<br/>OpenDrone-V2, workspace 3 inch"] --> V["Named version"]
V --> R["releases/rev/<br/>STEP, drawings, manifest"]
| Source | Onshape document OpenDrone-V2, workspace 3" |
| Link file | cad/onshape.json: document, workspace, element and part ids |
| Released exports | releases/<rev>/, exported from a named Onshape version and never edited. No revision has been released yet. |
| Parts per set | parts.csv |
| Fasteners and hardware | hardware.csv |
| Standard | Incutec mechanical repository template |
17 part types, 23 pieces, 8 of them carbon. Taken from the
Onshape assembly (snapshot of 2026-10-09). Materials are as set in the Onshape model and blank where
the model sets none; the process column is not from the model. Carbon plate and side plate (Standoff-L/R)
thicknesses are measured values.
Receiver/Antenna-Mount is kept in the frame Part Studio but is not part of the set
(modelCheck.ignoreUnused in cad/onshape.json). BigBoot, Bumpr and xt30Mount are in the
assembly and not yet in parts.csv; the model check lists them.
| Part | Qty | Material | Thickness | Made by |
|---|---|---|---|---|
| 20mmx4mm | 4 | Aluminum | CNC aluminium | |
| Airtag/Antenna-Mount | 1 | PLA | 3D print, TPU | |
| anti-slip pad | 1 | moulded silicone | ||
| Arm | 4 | Carbon fiber epoxy (61%) | 4 mm | CNC carbon plate |
| Base-Bot | 1 | Carbon fiber epoxy (61%) | 2.5 mm | CNC carbon plate |
| Base-Top | 1 | Carbon fiber epoxy (61%) | 2.5 mm | CNC carbon plate |
| bootFL | 1 | 3D print, TPU | ||
| bootFR | 1 | 3D print, TPU | ||
| bootRL | 1 | 3D print, TPU | ||
| bootRR | 1 | 3D print, TPU | ||
| Cam-Mount-L | 1 | PLA | 3D print, TPU | |
| Cam-Mount-R | 1 | PLA | 3D print, TPU | |
| Cross | 1 | Carbon fiber epoxy (61%) | 4 mm | CNC carbon plate |
| Standoff-L | 1 | Aluminum | 6 mm | CNC aluminium |
| Standoff-R | 1 | Aluminum | 6 mm | CNC aluminium |
| Top | 1 | Carbon fiber epoxy (61%) | 2 mm | CNC carbon plate |
| VTX-Mount | 1 | PLA | 3D print, TPU |
Fasteners and hardware per set, from the same assembly:
| Item | Qty |
|---|---|
| Hex nut grade A & B M2x0.4 | 4 |
| Hex socket countersunk head screw M2x0.4 x 5 | 4 |
| Hex socket head countersunk screw grade C M3x0.5 x 8 | 2 |
| m2 pressnut | 4 |
| m3 pressnut | 7 |
| Socket button head screw M2x0.4 x 10 | 10 |
| Socket button head screw M2x0.4 x 22 | 4 |
| Socket button head screw M3x0.5 x 10 | 5 |
| Socket button head screw M3x0.5 x 6 | 14 |
| Socket button head screw M3x0.5 x 8 | 2 |
| softmount m2 | 8 |
| Washer M3 | 5 |
Motor screws (16 x M2x6) ship with the motors and are not frame hardware. The Onshape
assembly names the Base-Top press nuts m2.5 pressnut (6); they are M3 and there are 7,
so hardware.csv lists m3 pressnut 7. Both are under modelCheck.ignoreHardware and
reasons in cad/onshape.json.
Result of the Incutec Onshape model check, run offline on 2026-10-09 against the snapshot of workspace 3" in the Onshape document. A row stays until the model is fixed.
| Check | Finding |
|---|---|
| Materials | bootRR, BigBoot, bootFR, bootFL, xt30Mount, Bumpr, anti-slip pad and bootRL have no material set in the model |
| Parts list | BigBoot: assembly 1, not in parts.csv; Bumpr: assembly 1, not in parts.csv; xt30Mount: assembly 1, not in parts.csv |
| Hardware | m3 pressnut: hardware.csv 7, assembly 0 |
| 3" | |
|---|---|
| Top plate | 2.0 mm |
| Middle plate | 2.5 mm |
| Bottom plate | 2.5 mm |
| Cross | 4.0 mm |
| Arm | 4.0 mm |
| Side plates (Standoff-L/R) | 6.0 mm |
| Bolt holes | Ø2.1 (M2) and Ø2.9 (M3), sized to grip the screw thread |
| Press-nut holes (Base-Top) | 7x Ø4.5 with Ø5.5 x 1.0 recess (M3), nut flush with the top face |
| Countersinks (Base-Top) | 2x Ø6.5 x 90° on Ø2.9 (M3) |
| Bolt-head counterbore | Ø3.8 (M2 ISO 7380) |
| Countersink | Ø2.6 + 1.5 mm 45° (M2.5 ISO 10643) |
| Camera mount thread | M2.5 |
Chamfers 0.5 mm 45°, outer fillets R1.0 mm, inner fillets R1.05 mm unless the released drawing says otherwise. The cross-to-arm interface is a press fit and is the tightest tolerance in the design. These are design values: no drawings have been released from this repository yet.
Hardware licensed under CERN-OHL-S-2.0, see LICENSE. Contributing: CONTRIBUTING.md.