This is model of soldering iron press for threaded inserts.
For this stand I used an old 2 pc 8x370mm rods from my printer( rods have groves so were useless in 3d printer) and 2x LMU08 bearings.
Parts were printed in Bambu Lab PET-G Basic Blue filament.

Threads M4 in base and end cap was tapped in the material.
In slider I used a M4 threaded inserts. Tap is to long to make the thread inside this hole. 

Used items:
8x370mm steel rods from printer-2pc
LMU08 berings -2pc
Tension spring 30mm long- 2pc

Fasteners used:
Screws:
M3x25mm Socket Head Screw- 2pc
M4x8mm Socket Head Screw- 6pc
M4x25mm Socket Head Screw- 2pc
Nuts:
M3 Nylock Nut- 2pc
M4 Nylock Nut- 5pc
Washers:
M3 washer- 4pc
M4 washer- 8pc
Inserts:
M4x8mm threaded insterts- 2pc

Material:
PLA, PET-G, ABS, etc.

Layer High:
0,3 or lower ( 0,2 will be good)

Support needed under rib in slider.