opTake

An open-source surgical tubing intake for FIRST Tech Challenge. Set your axle and tubing, check the model, and download a file that’s ready to print.

Hub Spokes Axle type Axle tolerance Added to the shaft size. Raise it if the hub is hard to slide on.

Tubing Inner diameter Outer diameter Barb length From the hub face to the tip of the barb.

Printing Together / split Split cuts the hub through the barbs so each half prints flat.

Open in Onshape

Loading the CAD engine (about 7 MB)…

Show tubing

On the robot

Tubing: Set the inner and outer diameters to match your tubing. You may need to adjust them slightly to get a perfect fit. If the tubing tends to slip off, add a zip tie for extra retention.
Axle tolerance: Start at 0.1 mm. If the hub won’t slide onto the shaft, reprint at 0.15 or 0.2 mm. Negative values give a press fit.
Spokes: More spokes give more contacts per revolution. Fewer spokes leave more open space between them.

Material: PETG or PLA+ both work. PETG survives impacts better.
Split or together: We recommend printing it split: print the two halves, then join them together on the axle. This way, no supports are needed. If you print it in one piece, orient it with the bore facing the bed and use tree supports.
Strength: Use at least 3 walls and 40% infill so the barbs don’t snap.

The Onshape document is public, and the model and this website are on GitHub. If opTake saved your team some time, a coffee helps keep it maintained.