Here is an update on a previously posted filament splicing jig.
I added cutting guide, improved the overall strength, and added m3 knobs.
All the needed hardware to complete is:
4 x M3 Nuts and 2 x M3 16mm Hex Socket Bolts
The standard version has open top channels for easy spool splicing.
The enclosed version has top bracing for even more strength.
I'll update with pictures as soon as I can. Enjoy!