I have searched for a 3D printable toggle clamp without finding something suitable - so I've done the design job. The models I have found seem to be more or less copies of steel sheet designs, not really adapted for 3D printing.

My use case is in test jigs for circuit board in a “bed of nails” (pogo pins) board tester. I need a clamp that:

• Fully opens vertically, so that the arm gets out of the way for unloading and loading the board
• Can hold the board securely against the spring force from multiple pogo pins

For a toggle clamp to work, the dimensions need to be quite accurate so that the clamp locks in place when the height of the vertical rod is correctly adjusted. For this reason, I am using steel dowel pins (dia 2mm, 20 mm long) for the four shafts. The hole dimensions also need to be dialed-in quite precisely - so that they can be printed without post processing with minimal clearance to the dowel pins.

The parts should be printed as shown (and proposed in my original print profile):

• The threaded bar should have a brim - for print stability
• The arm should have support as shown in one of the illustrations
• Number of walls: 4 (for strength)

Other parts can be printed without support.

This profile works great on my Bambu Lab A1.

If using a less precise 3D printer, post processing of the holes with a 2mm drill bit might be needed.

The base holes are for M3 bolts.

EDIT 7-jan-24, update to v2

The original model had some flaws. In particular, the arm had to be stopped when closing the clamp, to fix it at the right point. I've also added material around the base dowel pins to increase the strength. This v2 has been extensively use tested (photo 5) for several weeks - and has not revealed any further weaknesses - but comments / feedback are welcome!