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Retractable purge mechanism
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Topic starter
24/03/2022 5:16 pm
So I have the mechanism calibrated and things work for N changes(where N is any number.. could be 10.. could be 80) and then I'll get a blob that sticks in the mechanism and causes further issues. Is this due to improper cooling(eg should I cool longer?) or is there any other suggestions?
Thanks
24/03/2022 6:27 pm
Blobs have 2 requirements 1)stick during creation and 2)pop-off when cool. The 2mm wide kapton strip on the metal tack provides the right balance stuck just enough. But the blobs have to be placed in the center(ish) of the tack on the tape and be squished down(ish), you don't want it too squished or the nozzle will get stuck, and you don't want it too high or the blob will be too hight to clear the gap between the tack and the guard. I'm not sure which is happening but 80 is too few to get a stuck blob. It should be in the thousands so something is wrong.
Can you attach a video of a blob being made?
Topic starter
25/03/2022 1:35 am
So when I got home to look at the mechanism I saw that the kapton had come off which is probably the problem. Any suggestions on getting it secured well after wrapping it to the bottom?
31/03/2022 2:29 pm
sorry for the late reply, the forum has been down.
Try to touch the sticky side of the kapton as little as possible. I suggest using a pair of metal tweezers to hand it.
Make sure the kapton is straight, and wraps all the way around, to stick on itself. That should keep it in place. It sticks very well to itself.
Garry Jones reacted
26/07/2022 9:12 pm
The blob is either forming too far from the tack or is too big.
If it's the former then you can try loosening the 2 screws and pushing the RPM bracket to twist it clockwise a little then tighten the screws. The blobs can be measured for height and that is the distance from the nozzle to the tack. Each blob should be close to 3mm in height. Otherwise you can try printing a height adjustable bracket from the list of brackets in the instructions.