If the space pen is pure physical structured, it can be cycle used with the ink. So why not replace the gas plug by the one way valve based structure, and let the writing pressure itself push the ink out?
It has been years since I have my logo changed. When the idea about the cosmos and a bowl of rice came out of mind, I told myself I should make it real. It took about 5 hours to go through all the work.
The rough sketch in Painter. Again, the same as the old logo, the black humor in the bowl. After taking off the p**ts, the infinite world is inside XD. Maybe only the ACGer can find out what it really means.
Some of the recent exercises that I did. I shared the source files here. Click the image to download the source file.