by JonatanBlom, published
This is just another filament straightener, a straight filament creates less friction in the bowden tube. It also enables you to make use of those last turns of filament that are tightly coiled around the center of the spool.
To assemble you will need a 3.3mm drill and a M4 threading tool, the drill is used to clean the holes before threading. When I do the threading I soak the parts in water to give lubrication and cooling, don’t thread to fast it might cause the plastic to melt and destroy the threads. On the deep threads retract the tool when you are halfway down to remove waste before you continue the last part.
I bought the parts on eBay, I won’t update the links when they become obsolete but it’s not too hard to find similar items:
Washer M4 4x9x0.8mm (14pcs)
http://www.ebay.com/itm/M3-M4-M5-M6-M8-M10-Stainless-Steel-Metric-Flat-Washers-Screw-Repair-Kit-Tool-HPT-/191543215195?var=&hash=item2c98dd845b:m:mrW8YYdorSzqVhz08qLUDFQ
V-Groove ball bearing 4x13x6mm (ID,OD,Thk) (10pcs)
http://www.ebay.com/itm/10Pcs-Metal-Sealed-Guide-Wire-Line-Track-Deep-V-Groove-Pulley-Rail-Ball-Bearing-/321898243903?hash=item4af2a1673f:g:jJQAAOSwT5tWJeYd
Socket head cap screw M4x18mm (8pcs)
http://www.ebay.com/itm/M4-304-Stainless-Steel-Allen-Hex-Head-Socket-Cap-Screw-Bolt-DIN912-/182015074419?var=&hash=item2a60f1a073:m:mGVj6hugxesvZHLkvNoie3Q
Countersunk head screw M4x20mm (10pcs)
http://www.ebay.com/itm/M4-304-Stainless-steel-Countersunk-head-Allen-Hex-Socket-Screws-Bolt-DIN-7991-/172090959814?var=&hash=item28116ba7c6:m:mrQV7wodUyXWZNQQHbLQf4A
M4 nut (6pcs)
http://www.ebay.com/itm/M3-M4-M5-M6-M8-M10-M12-M14-M18-M20-M24-DIN934-316-A4-Stainless-Steel-Hex-Nuts-/322100947156?var=&hash=item4afeb668d4:m:mnrFRS45COubg8NUndMvimg
Thread tap M4x0.7
http://www.ebay.com/itm/Hot-M3-M4-M5-M6-M8-High-Speed-Steel-HSS-Screw-Thread-Metric-Spiral-Hand-Plug-Tap-/201482756375?var=&hash=item2ee94ee117:m:m3UsDejuY2Syig2jSvTJpyQ
Update V2: Added two more v-groove ball bearings to guide the filament in and out of the straightener. Initial version available in zip archive.
Printer Brand: Ultimaker
Printer: Ultimaker 2
Rafts: No
Supports: No
Resolution: 0.1mm
Infill: 70%
Notes:
Top/bottom solid layers and outline shell => 10
