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Description
Instructions for Modular Origami Arches 6 by WilliamClinch on DeviantArt
(work in progress)

Start with a piece of paper atleast 2.2 x taller than wide
1, 2, 3 - Fold in half, quater, then eighths, and unfold. Leave the left-most 8th folded in. This will leave the piece in 7 sections
4 - flip over
5 - fold upper left corner down-and-right. fold lower section up-and-right
6 - fold/unfold the top half at the 3rd and the 6th sections. Mirror for the bottom half
7 - unfold the diagonal folds from step 5
8 - Fold the top down along the top-most of the new horisontal creases, and then fold the bottom up, along the bottom most.
9, 10 - flip over
11 - for each corner of the front-most piece, fold diagonally inwards, such that each tab is 3-sections wide. then unfold these corners
12 - poke each corner inwards, so they are inside the model
13 - it should look like this
14 - fold the front diamond-like section, such that the current down-pointing part, ends facing up, and the up-pointing ends facing down.
15 - it should look like this
16 - for the right-hand of the lower part, fold/unfold along the 4th section, the fold the left along the 3rd section
17 - the front-bottom flap has the 8th section tucked into it. unfold it
18 - fold the front-bottom section back left, reversing the end of step 16
19 - fold the right-hand of the lower part, so that it is 2 sections wide
20 - fold the left-hand of the lower part, so that it is 3 sections wide, and tuck it into the diagonal-corner-flap of the right-hand part
21 - for the top part fold/unfold a 2-section wide triangle, then poke it inside the model
22 - for the inside-triangle, fold diagonally up-left
23 - for the new square created from the triangle, fold the square diagonally up-right
24 - fold the top-left corner of the triangle/square down-right, reversing the fold of step 22
25 - it should look like this
26 - mirror steps 21-24 for the left hand side
27 - for the top-front part, fold the lower-right corner up-right, to create a 1-section wide triangle
28 - the top part now has a 3-section wide tap, while the bottom part has a 3-section wide slot. slot the tab in to the slot. the model will not sit flat at this point
29 - push in from the sides. this will be tricky, and the best method I have found so far, is to start at the bottom. From below, the "column base" will begin flat, then become hexagonal, and finish at 1-section-wide, 2-sections-tall.

not yet covered in these instructions:
-how to join multiple arches
-how to add curve to the arches
-how to add a longer colum for the bottom

Description
Instructions for Modular Origami Arches 6 by WilliamClinch on DeviantArt
(work in progress)

Start with a piece of paper atleast 2.2 x taller than wide
1, 2, 3 - Fold in half, quater, then eighths, and unfold. Leave the left-most 8th folded in. This will leave the piece in 7 sections
4 - flip over
5 - fold upper left corner down-and-right. fold lower section up-and-right
6 - fold/unfold the top half at the 3rd and the 6th sections. Mirror for the bottom half
7 - unfold the diagonal folds from step 5
8 - Fold the top down along the top-most of the new horisontal creases, and then fold the bottom up, along the bottom most.
9, 10 - flip over
11 - for each corner of the front-most piece, fold diagonally inwards, such that each tab is 3-sections wide. then unfold these corners
12 - poke each corner inwards, so they are inside the model
13 - it should look like this
14 - fold the front diamond-like section, such that the current down-pointing part, ends facing up, and the up-pointing ends facing down.
15 - it should look like this
16 - for the right-hand of the lower part, fold/unfold along the 4th section, the fold the left along the 3rd section
17 - the front-bottom flap has the 8th section tucked into it. unfold it
18 - fold the front-bottom section back left, reversing the end of step 16
19 - fold the right-hand of the lower part, so that it is 2 sections wide
20 - fold the left-hand of the lower part, so that it is 3 sections wide, and tuck it into the diagonal-corner-flap of the right-hand part
21 - for the top part fold/unfold a 2-section wide triangle, then poke it inside the model
22 - for the inside-triangle, fold diagonally up-left
23 - for the new square created from the triangle, fold the square diagonally up-right
24 - fold the top-left corner of the triangle/square down-right, reversing the fold of step 22
25 - it should look like this
26 - mirror steps 21-24 for the left hand side
27 - for the top-front part, fold the lower-right corner up-right, to create a 1-section wide triangle
28 - the top part now has a 3-section wide tap, while the bottom part has a 3-section wide slot. slot the tab in to the slot. the model will not sit flat at this point
29 - push in from the sides. this will be tricky, and the best method I have found so far, is to start at the bottom. From below, the "column base" will begin flat, then become hexagonal, and finish at 1-section-wide, 2-sections-tall.

not yet covered in these instructions:
-how to join multiple arches
-how to add curve to the arches
-how to add a longer colum for the bottom