Tetris Heart Puzzle 2.0

Note: This is one of my first designs in Fusion 360 and definitely my first posted online. All feedback is welcome and appreciated so I can learn. Thanks!

Overview

I loved the look of Suterén's Tetris Heart Puzzle but ran into structural problems with the print. Additionally, the pieces weren't “proper” Tetris pieces as they included non-Tetrominos. I decided to rebuild their puzzle from scratch as a weekend learning project in Fusion 360 while making some improvements. 

What is it?

This is a 10-piece, Tetris-inspired puzzle with a self-containing box. It includes a cutout to easily open the box and a cutout heart. It has a locking mechanism to avoid the puzzle coming open and spilling the pieces. I believe the puzzle has only one solution but would love to find out if anyone can find multiple solutions. 

How is it different than the original?

I've made several changes:

1. The pieces and solution have been redone to use Tetronimos.
2. Two permanent blocks have been added to increase difficulty and fit the pieces without gaps.
3. The sliding mechanism was reworked to be more tolerant of printing variation and less fragile.
4. The top and bottom box pieces have a locking mechanism to avoid falling open unexpectedly.
5. The heart is now a full cut-out to avoid bridging problems and/or ugly surface from supports. I think it also looks nicer with the bottom's color showing through.

Recommended Print Settings

Make sure all pieces are flat on the bed. The top will need to be flipped over for printing. I used 25% infill but I imagine 15% should be fine. It also printed great at 0.2mm layer height. No supports should be needed. You may need a brim if you're experiencing warping of the box parts.