carandacher
Member
I am thinking about making a rollerball pen with a cap and I wonder how one usually achieves that the rollerball refill inside the pen doesn't get to move vertically?
I guess some people use springs or plastic tubing at the non-writing end of the refill, some use threaded refills and most usually the length inside has to be perfect match to the length of the refill?
What has worked for you?
I guess some people use springs or plastic tubing at the non-writing end of the refill, some use threaded refills and most usually the length inside has to be perfect match to the length of the refill?
What has worked for you?