Land-based missile launcher pen holder

This model is a pen holder shaped like a fully 3D-printed land-based missile launcher, featuring an interlocking assembly design requiring no screws or additional fasteners, and no components beyond 3D printing, allowing for adjustable pen holder angles. Note that the two C-shaped decorative housings should be removed only after the build plate has completely cooled to prevent uneven shrinkage and warping due to inconsistent temperatures. Installing and removing the cylindrical gear may require some force; slight tilting and compression of the bracket may be necessary for insertion. Currently, the locking mechanism supports one-way locking; the other direction remains unresolved, though it does not affect normal usage.