Main mounting blocks for homemade guitar. I did these for a semi acoustic guitar and needed somewhere solid to mount the neck, pickups and bridge.
For a 24.75“ scale bolt on neck. Two humbuckers and standard Gibson Tune-o-matic style bridge.
Two parts so it fits my Ender 3. A matching slot on the mating faces was filled with a 1/8“ ply rectangle and glued together with epoxy.
Could be replaced with dowels. Added files for 10mm (3/8") dowel instead of slot. Each dowel 30mm long.
Bridge mounting holes will be in the range of small holes at the back end of the bridge block just used to make solid layers around the bridge mounting area with no infill.
The pointed back end of the bridge block is to fit my purpose, cutout in that point is for wood brace to back of body. That end could be chopped off square or whatever in Tinkercad or program of choice.
The bridge and neck blocks will be under a wood top with matching cutouts.

Ender 3
PLA
1mm nozzle
20 % infill
Yahoo, Tinkercad