Did you ever have trouble getting a wire to go into the end of the nozzle? This makes it easy with a funnel on both ends. Top funnel lines up nozzle and bottom funnel makes a big target to guide the tiny wire into the tip of the nozzle. This would be better if it could be made of metal but I'm lazy. -NPG_01 has a 1mm dia hole but it tends to shrink a lot when printed. If the 0.4mm probe won't go through you can either drill it out with a #78 drillbit or you can push a heated pin through the blockage. January 15: -NPG_02 has a 1.2mm dia hole which may also be too tight but it should be easier to push a pin through. Jan 28: -Found a mistake in my drawing and corrected it. Also moved handle to the bottom of the tool so that it could be printed vertically to get a rounder interior. No support needed. -Uploaded NPG_05