This is the original video I wanted to make without jump cuts. As you can see, it is very, very long. I have kept a lot of failures and former outtakes in this version. Enjoy the building process as it started in March 2023 and ended in December 2023.

LEGO Loop Coaster 10303: https://www.lego.com/enus/product/lo...

This roller coaster is powered by a Spike Prime hub running Pybricks.

0:00 First loop
2:55 Test 1 FAIL (too low)
3:05 Test 24 OK (why not too low now?)
3:25 Increase exit height
3:50 Test 5 FAIL (too low for sure)
3:59 Increase ramp height
4:43 Test 67 OK
5:03 Create small track
11:42 Test 810 OK (ride of first circuit, 2 cars, 3 cars)
12:09 Test 1112 FAIL (4 cars)
12:27 Increase sturdiness
14:23 Test 13 OK (increased sturdiness helps with speed)
14:33 Stress test with several trains
14:45 Add loop pass through
15:00 Test 14 OK (cleared pass through)
15:10 Add second train to pass through
14:12 Test 15 OK (cleared second train)
15:21 Update the track to include route to the pass through
17:12 Test 16 OK (include route to pass through)
17:25 Update the track to include route after the pass through
24:13 Test 17 OK (smoke test track with pass through)
24:30 Complete missing support
24:44 Test 1819 OK (2 cars in train and faster starting speed)
25:06 Increase ramp height
27:44 Test 2022 OK (single car run)
28:09 Lifter type 1
37:32 Legs to lift the track
38:23 Lift the track
55:15 Chain
56:15 Chain pass throughs
57:19 Studless track connector
57:34 Upgrade lift
1:00:23 Top chain guide idler gear
1:03:01 Spike Prime
1:03:15 Test 23 FAIL (chain too loose)
1:04:08 Test 24 OK
1:04:47 Sensor for train detection and speed control
1:05:23 Test 25 FAIL (lifter chain jams)
1:05:59 Upgrade lifter to reduce risk of chain jamming
1:07:50 Test 26 OK (fix worked... for now)
1:08:17 Second loop
1:10:41 The incident
1:11:01 Construction continues with caution
1:11:38 Loop 1 should be widened
1:12:45 Test 27 FAIL (loop 1 requires more speed)
1:12:52 Increase lift height
1:16:42 Test 28 FAIL (more speed!)
1:17:11 Increase lift height
1:20:05 Test 2930 FAIL (even more speed!?)
1:21:34 Shorten lower section to clear lift section easier
1:22:38 Test 31 OK (shorter lower section did the job)
1:22:44 Update the track to account for moved pass through
1:26:05 2 wide expansion section
1:27:43 Buffer sections to decrease issue with expansion
1:29:18 Change track to increase exit speed
1:21:13 Upgrade track to include loop 2
1:34:27 Dual lift
1:37:27 Lower track upgrade for second lift
1:45:22 Second lift
1:50:59 Ramp for loop 2
1:51:56 Test 32 FAIL (loop 2 requires more speed)
1:52:01 Increase ramp height
1:52:31 Test 33: OK (ramp height OK)
1:52:40 Track to second ramp
1:57:28 Test 34: OK
1:57:36 Upgrade upper track to be less boring
2:00:16 Test 35: OK
2:00:23 Finish up upper section
2:02:08 Test 36: FAIL (Speed for loop 1. Stop on tall lift)
2:02:29 Stabilize expansion sections
2:02:54 Test 37 FAIL (chain pick up fail)
2:03:46 Change lower speed
2:04:16 Test 3839 FAIL (loop 1 speed, expansion section)
2:05:16 Upgrade expansion section
2:08:06 Test 4045 FAIL (chain, speed)
2:09:48 Attempt to increase loop 2 entry speed
2:12:20 Test 46 FAIL (not fast enough)
2:12:31 Stabilize loop 2
2:14:10 Test 47 OK (stabilization worked)
2:14:23 Upgrade supports
2:25:06 Test 48 FAIL (chain jams)
2:26:28 Support upgrade continues
2:29:23 PTO upgrade for lifts. Reduce friction and wobbliness from pillars
2:56:10 Test 49 FAIL (stall on top)
2:56:16 Decrease top gap
2:59:07 Test 5051 FAIL (speed to loop 1, stall on top)
2:59:36 Continue lift upgrade
3:06:14 Test 5254 FAIL (4 train chaos)
3:07:19 Increase speed by decreasing head injury
3:08:26 Test 5557 FAIL (chain snaps)
3:09:16 PTO sturdiness fix
3:14:29 Test 58 FAIL (chain jump and loop speed)
3:14:47 Clutches for PTO alignment
3:15:12 Move sensors to detect trains quicker
3:19:40 Test 59 FAIL (speed)
3:19:58 Attempt to increase speed
3:22:10 Test 60 FAIL (speed)
3:22:27 Attempt the same
3:23:14 Test 61 FAIL (train crash)
3:23:50 Increase lift height
3:25:14 Running out of base plates...
3:26:08 Test 62 OK (good speed)
3:26:21 Continue height increase
3:33:42 Continue pillar upgrade
3:42:00 Expansion section color fix
3:43:36 Green tiled base plate upgrade
3:44:34 Test run at Skærbæk Fan Weekend 2023. Failed even with lighter cars!
3:44:57 Upgraded base with lakes
3:49:06 Upgrade the lifts: Rely only on PTO and make the chain replacement easy
3:51:26 Upgraded track layout: Marked pillars for easy setup
3:54:58 Struts to reduce flex
3:55:46 New high speed lead up to loop 2
3:58:26 Banked curve for higher speed into loop 2
4:01:28 New lower track section
4:04:56 Final construction of Ramp 1 and Loop 1
4:11:28 New spiral flow exit
4:12:34 Entry gate from the video game Theme Park
4:12:54 Lighter trains to reduce upramp stutter
4:13:13 Activation from outside. Enjoy the ride!
4:15:21 Bonus footage from Bricking Bavaria 2023 without lakes and markers