Things you'll need to build a PantoProbe:

Materials:

• 4 x 0.2" lengths of  3/16" brass tubing
• 4 x 0.69" lengths of   5/32" brass tubing
• 8   #8 SAE flat washers 
• 1   1/4-20 nut
• 1   1 " long 1/4-20 bolt
• 5   3D Printed parts
• 3   self adhesive rubber feet
• 1   camera ball mount  careful to get ones that have the 1/4-20 threads. Search Ali Express for tripod mini ball head.
• graphite powder

For the most basic electrical probe you'll also need:

• 1   1/8" length of stainless steel tubing (or brass in a pinch)
• 1  1" length of 22 gage piano wire  (For the probe tip)

Tools:

• 54 tooth razor saw or other way of cutting the tubing
• A file or sandpaper to de-burr the brass tubing/plastic parts
• Some way of holding the tubing during cutting like a vice or clamp

In order to get a good press fit for the brass tubing I've done two things.  First all of the holes are octagons so minor changes in hole size don't have as big an impact on fit.  Second I created a sizing gage.   Print this first, and try fitting a piece of 5/32" brass tubing in the holes.  If the tubing slides in without any tapping you need to pick the next smaller size hole.

The holes next to the - sign indicate you should use the under sized hole model.  The middle hole is for the standard model, and the + hole matches the over sized hole model.

I've printed these models in both PLA and ABS.  In the videos all the things are printed using my Prusa i3 Mk2 with PLA.   I just use 0.2 layer height, and the default infill percentage.  No supports or brims required.   I'm sorry the main arms are somewhat long so they may not fit in some peoples printers.  Check out the PantoFlex model for a smaller printer based build.

I've also created a 5x version of the PantoFlex that gives you even more control, and it has an integrated twist lock so all you need to build the input probe is maybe 2" of 1/8"  SS Tubing and an inch of 22 gage Piano wire.  Print the parts and press the twist lock cap on.   The 1/8" SS tube passes though the center hole.  If the notch on the dial is aligned with the one on the base, the tube should slide in fairly easily.  Twisting the cap locks the tube into place making height/direction adjustment a breeze.

I've added a version of the PantoFlex that has a clip for holding a standard scope probe.   Clip the probe in, and lock it in place with zip ties.   The problem with this design is that the probe still has to stick out fairly because the scope probe tent to have a flare for your fingers right were you'd want the pantograph to grip it.  This long stick-out makes the probe less stable and reliable than the 22# piano wire probes, and there's no easy way to adjust the height apart from printing out a shorter base.  It's still way better than trying to probe by hand, but this is clearly not the final design for this.  I'd like to try and grip the probe even lower down to make it more stable.   If this is the first probe you build, just remember that it is physically as nice to use as the 5x twist locking version that uses a custom probe.