Summary

This is a remix of JIPyro's Steam Controller Shoulder / Bumper / Trigger Mechanism.
It has these improvements:

adjusted all the measurements so the part can be printed and installed without needing to be heat bended
added base for trigger spring
added nub for the top plate
remade the design file in FreeCAD 0.21.0 and made it easier to adjust, in case someone wants to modify it

Print Settings

Printer Brand:

Tronxy

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Tronxy XY-2</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>Yes</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>0.4mm</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>10</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>I printed it for now in PLA and it seems fine for now, but I'll get it in PC if it breaks, as JIPyro suggested.</p></div>

Post-Printing

Finishing up the part

            <div><p>Printing the part with Cura's tree supports worked out moderately well, though I did need an exacto knife to clean things up.</p><p>For the holes holding the trigger button's rod, I kept them at the original 2mm and manually, very carefully enlarged them using the torx T6 bit which is used to open up the Steam Controller.<br>Had to be pretty careful not to enlarge them too much so the friction would keep the rod in.</p></div>

How I Designed This

This being a remix of JIPyro's Steam Controller Shoulder / Bumper / Trigger Mechanism, I downloaded his FreeCAD file and started adjusting it.

First of all, the design needed to be ported to the latest FreeCad version (0.21.0) to properly support Bodies, reordering history, Datum Planes etc.

I also fully constrained the sketches, used dimension names and expressions, and based extrusions/paddings off of datum planes (to circumvent FreeCAD's topological naming problem).
The design is a lot more parametric and modifiable now, so if you want to improve on it, please go ahead.

Good:

the bumper and trigger fully click
the buttons' feel is 95% the same

To be improved:

the clicks have a slightly different sound — probably partly due to PLA vs original ABS and partly slight differences in
the trigger is marginally less springy - spring base could probably be slightly heightened
to compress the spring more
the trigger button and bumper don't perfectly align as in the original (maybe 0.5-0.25mm difference), but it's unnoticeable while normally holding or looking at the controller

Steam Controller - improved Shoulder / Bumper / Trigger Mechanism