Adapters: Multiple Generic To D1 Mini (x5)

I present my multiple refill adapter model. It contains 5 adapters, for use in pens that take a generic plastic tube ballpoint refill, with the small tabs on the side, which make contact with the pen's spring. The adapter allows such pens to use the Mini/Multi D1 refills instead (not included).
These refills come in various lengths, with three popular lengths being around: 88mm, 98-99mm and 107mm. They are around 3mm in diameter. The D1 refill is around 67mm long and 2.3mm in diameter.

The D1 refill, in most cases, holds less ink than the refills it will be replacing. However, it can be difficult to find high quality refills in the original refill's size, while there are many high quality D1 refills easily available.
Options range from oil-based, to pressurized, hybrid, emulsion and gel inks, like the Pilot Hi-Tec-C Slims or Zebra JSB, so this adapter exists to hopefully provide flexibility, between your favourite pens and refills.

The adapters need to be printed in the polished white or coloured plastics, as the smooth polished finish is functionally desirable. The D1 refill is held in place, by the adapter, using friction. The holes around the side of the adapter are present to help with the removal of unbonded plastic powder from the core, when being polished. However, some powder may still need to be removed, with a pin or thin metal rod, before inserting the refill.

The adapters will need to be separated from each other using a sharp craft knife or zero angle side cutters. The sprues will need to be removed and the points where they connect to the adapters; smoothed flat.

The adapter may need to be modified in two ways, to allow it to work as a replacement for any specific refill.

Firstly; the lower part of the refill (the thinner section) may need to be cut to length. A D1 refill needs to be installed, then the adapter should be lined up with the original refill, so that the ballpoint tips are level, then any protruding plastic should be cut from the end of the adapter, so it is the same length as the original refill. The grooves in the tail section of the adapter show the cut points for 88mm and 98.5mm, which are popular refill lengths. The adapter is supplied in a length suitable to replace a 107mm refill without modification.

Secondly; the upper, wider section may need to be trimmed, depending on where the spring contacting tabs are on the original refill's body. Again line up the original refill and the adapeter, with a D1 refill installed, as mentioned above. Cut away any plastic material on the adapter, that is above the upper edge of the original refill's tabs. The grooved rings on the upper section of the adapter are spaced 2mm apart and are present to help make cutting the material eisier. The position of the cut does not need to be too accurate, compared to the original refill, so using one of the grooves, that's a little above or below the original refill's tab position, shouldn't be an issue.
Cut's should be made with a sharp craft knife or box cutting blade, onto a cutting mat or other suitable surface.

Due to the very varied nature of pen design, I cannot guarantee that this adapter will work with any specific pen, although I've made every effort to make it as universal as possible.

I plan to make as many refill types compatible with as many host pens as possible, so If you have any suggestions on refill adapters, please let me know and I can hopefully make it available, depending on the relative sizes involved. I have now created dimensioned drawings of over 80 standard and obscure ballpoint, gel and rollerball refill types, so I like to think that I have a fair idea of what is and isn't possible.